Last modified: June 17, 2024, 12:18 p.m.
A very rare species in Belgium, but as with many others probably overlooked. The search for the cases after 2004 gives us a better look at the distribution of this species.
Native
A straw-colored, slender, three-valved case of the type “tubular silken case”; length about 10 mm, mouth angle 45°–60°.
See also bladmineerders.be.
The caterpillars make a lot of spinning where the tubes are secured. This creates holes with a striking white edge.
The eggs are deposited at the underside of a leaf with cases found most of the time here. Cases can be found from August till June of the following year with larvae fully fed in June.
This species prefers mostly sandy soil.
The adults come to light.
The adults fly in one generation a year from late June till mid-August.
The larva feeds mainly on Achillea millefolium and Artemisia vulgaris but is also reported on Carduus, Inula and Leucanthemum.